Use Chrome or other browsers to inspect the network requests (F12 -> XHR).
Copy the cookie to key.json
Use image_generation.json (in workflow) for Luma image2video generation.
Get the result id, record saved in output/luma video/record_id.txt.
Use check_result.json to retrieve the video link if Luma generation has finished. The video will be downloaded automatically if the download option is set to true.